1. Division of Paediatric Orthopaedic Surgery, and Department of Medicine, Shriners Hospital for Children and McGill University, Montreal, Quebec, Canada
2. Division of Paediatric Orthopaedic Surgery, Shriners Hospital for Children, Montreal, Quebec, Canada
3. Department of Medicine, McGill University, Montreal, Quebec, Canada
4. Personal Chair of Skeletal Biology, The Roslin Institute, University of Edinburgh, Midlothian, UK
5. Human Genetics Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California, USA
6. Department of Medicine, and Faculty of Dentistry, Shriners Hospital for Children and McGill University, Montreal, Quebec H4A 0A9, Canada